Add ability to pass in CONJUR_APPLIANCE_URL and CONJUR_ACCOUNT into Conjur class

[AndrewCopeland]

Is your feature request related to a problem? Please describe.

I am retrieving the CONJUR_APPLIANCE_URL and the CONJUR_ACCOUNT in a programmatic manner which means these settings are not set as Environment Variables or System Properties.

Describe the solution you would like

Ability to easily pass in these fields either to the Conjur ctor or add a Configuration object that can be passed into the Conjur ctor.

Describe alternatives you have considered

Currently I just use System.setProperty() method.

Additional context